| Autor: |
L. L. Balyberdin, E. Yu. Zmaznov, Yu. S. Kraichik, B. P. Krasnova, N. G. Lozinova, M. I. Mazurov |
| Zdroj: |
Hydrotechnical Construction; Mar2004, Vol. 38 Issue 2, p119-123, 5p |
| Abstrakt: |
It is shown that the operation of connection of a filter-compensating device (FCD) to the buses of tertiary windings of a converter transformer in parallel to another (earlier connected) FCD is accompanied by a transient process that virtually does not influence the operation of the converter. On the contrary, the operation of disconnection of FCD (at another connected FCD) is accompanied by a transient process that affects the operation of the converter strongly and unfavorably due to disturbing the commutation of valves and often causes locking of the converter. This is a result of saturation of voltage transformers used for controlling the converter upon connection of FCD. The effect can be eliminated by replacing 3NOM-type voltage transformers by NOM-type transformers for controlling the converter or by ungrounding at least one FCD. In addition to improving the operation of the converter these measures prevent a dangerous increase in the currents of primary windings of voltage transformers. Their efficiency has been confirmed by digital simulation and field tests of the back-to-back link between power systems of Russia and Finland. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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